code: def test_time_stretch(factor):
      audio = torch.randn(1000)
      sr = 8000
      ret = time_stretch(audio, sr, factor=factor)
  
file_path: espnet/test/espnet2/layers/test_augmentation.py
imports: import pytest
  import torch
  from espnet2.layers.augmentation import DataAugmentation, bandpass_filtering, bandreject_filtering, clipping, contrast, corrupt_phase, deemphasis, equalization_filtering, highpass_filtering, lowpass_filtering, pitch_shift, polarity_inverse, preemphasis, reverse, speed_perturb, time_stretch
label_desc: Use image node_id 9 for calling a global function with example usage: test_time_stretch(factor) without return types